Sudler. — Penilia. 
PLATE 1. 
Fig. 1. Adult seen from the side ; brood-chamber contains three young, the 
most anterior of which is rotated in the opposite direction from the 
one usually seen. 
Fig. 2. Adult seen from the dorsal side. The most anterior embryo on the 
left side has turned its dorsal side uppermost. The remainder 
have assumed the typical position. 
Fig. 3. Brood-chamber of adult containing eggs in the four-cell stage. Seen 
diagonally (dorso-laterally). 
Fig. 4. Brood-chamber of adult containing four eggs in the thirty-two cell 
stage. Seen from the dorsal surface. 
Fig. 5. Side view of a brood-chamber showing embryos with three thoracic 
segments. The most anterior embryo has its ventral surface 
turned inward and down. 
Fig. 6. Brood-chamber of an adult Penilia seen from the dorsal side. It 
contains four embryos in an advanced stage of development; all 
of which present their ventral surface to view. 
